电子探针在黑龙江省三矿沟铁铜矿床含金、银矿物研究中的应用

The application of EPMA in the study of minerals containing Au,Ag of Sankuanggou iron-copper mineral deposit,Heilongjiang province

通过对三矿沟铁铜矿床野外产出的地质特征及矿脉间的穿插关系、矿物共生组合特征的观察,结合光学显微镜观察和电子探针分析,研究了三矿沟铁铜矿床的含金、银矿物。将矿床的成矿期次划分为矽卡岩期、石英-硫化物期和表生氧化期3个成矿期5个成矿阶段。从物理化学性质上的变化,探讨了含金、银矿物的特征。碲银矿的发现在前人研究资料中未见有报道。碲银矿是铅锌硫化物阶段中的低温热液产物,分布于石英脉中,银部分被铁和铜替代,从颗粒的核部到边缘,铁铜含量呈上升趋势,银的含量呈下降趋势。银金矿主要产于低温热液环境,呈不规则粒状赋存于黄铜矿、黄铁矿颗粒间的石英脉中。银金矿在化学组成中金银含量有明显的变化趋势,银金矿颗粒由核部向边缘,银的含量呈上升趋势,金的含量呈下降趋势。

In the Sankuanggou Iron-Copper mineral deposit in Heilongjiang Province,China,the research on minerals containing silver and gold was made by means of the microscopic observation and electron probe microanalyzer（EPMA）.Combined with ore-forming characteristics,mineral cross cutting and mineral assemblages,three mineralizing phases,skarn,quartz-sulfideand supergene ones,and five mineralizing stages were identified.The features of the minerals containing silver and gold were discussed with changes of physical and chemical properties.It was the first time to discover hessite in Sankuanggou Iron-Copper mineral deposit,which was epithermal production in lead-zinc sulfide stage.Hessite distribute in the quartz veins,silver element was replaced by iron and copper element,forming core to rim.The content of iron which replaces silver increases gradually and the content of copper which replace silver reduce gradually.In addition,the content of iron and copper increases gradually,and the content of silver reduces gradually.Electrum produces mainly in the low-temperature hydrothermal environment.Chemical composition of electrum contained isomorphic replacement of silver.From core to rim,the content of silver increases gradually,the content of gold reduces gradually.